CCleaner 5.72 will start

[otalado]

CCleaner 5.72 starts when computer start, disregarding that  the Options->Settings-> Run CCleaner when computer starts is unchecked!

I have a PC running with minimal RAM, so I really don't need anything running in the background when I am not actually using it. Any ideas how to solve it?

[otalado]

Found the solution: if all the check boxes in Options->Smart Cleaning are unchecked CCleaner is removed from memory.

[nukecad]

Just to explain those two options a bit further:

"Run CCleaner when the computer starts" opens CCleaner when you start the computer,  does a one-off clean and then closes CCleaner.
It doesn't show the user interface onscreen it just cleans, you will briefly see the icon on the taskbar but you may not even notice it in all the other startup activity.
It doesn't leave anything running in the background.

"Smart Cleaning" runs in the background and monitors your computer for junk that is building up and/or for the closing of a browser.
Because it is always running in the background to monitor for those events then you will see an icon in the system tray, you may notice the icon flashing if/when it's actually doing a clean.

Smart cleaning uses your 'Custom Clean' settings to ensure that it doesn't clean things that you want to keep.

PS. Smart Cleaning doesn't use a lot of background resources, on my machine it's using 8.6 MB of RAM and every 15 seconds or so uses 0.3% of the CPU for a second before dropping back to 0%.